text: /*
   * Copyright 2019-present Facebook, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  #pragma once
  
  #include <unifex/config.hpp>
  #include <unifex/adapt_stream.hpp>
  #include <unifex/scheduler_concepts.hpp>
  #include <unifex/finally.hpp>
  
  #include <type_traits>
  
  namespace unifex
  {
    namespace _delay {
      inline constexpr struct _fn {
        template <typename Stream, typename Scheduler, typename Duration>
        auto operator()(Stream&& stream, Scheduler&& scheduler, Duration&& duration) const {
          return adapt_stream(
              std::move(stream),
              [scheduler = std::move(scheduler),
              duration = std::move(duration)](auto&& sender) {
                return finally(
                    static_cast<decltype(sender)>(sender),
                    schedule_after(scheduler, duration));
              });
        }
      } delay{};
    } // namespace _delay
    using _delay::delay;
  }  // namespace unifex
  